TB-500 (Thymosin Beta-4 Fragment): Research Applications and Mechanisms
An evidence-based overview of TB-500, a synthetic fragment of Thymosin Beta-4 (CAS 77591-33-4), examining its role in cellular migration, tissue repair, and actin sequestration in preclinical models.
Introduction
TB-500 is a synthetic peptide fragment of Thymosin Beta-4 (TB4), a naturally occurring 43-amino acid peptide encoded by the TMSB4X gene. With a molecular weight of 4921 g/mol and CAS number 77591-33-4, TB-500 is widely used in research investigating tissue repair, inflammation modulation, and cellular migration.
Chemical Properties
- Molecular Formula: C212H350N56O78S
- Molecular Weight: 4921 g/mol
- CAS Number: 77591-33-4
- Appearance: White powder
- Purity: ≥99% (HPLC verified)
Mechanism of Action
Thymosin Beta-4 and its fragment TB-500 exert their biological effects through several pathways:
Actin Sequestration
TB4 is the primary G-actin sequestering peptide in mammalian cells. By binding to monomeric actin (G-actin), it prevents polymerisation into F-actin filaments. This maintains a pool of polymerisation-ready actin that is critical for cell migration, a process fundamental to wound healing and tissue repair.
Upregulation of Actin
Research demonstrates that TB4 upregulates actin expression, promoting cellular mobility. This mechanism is central to its role in keratinocyte migration during wound re-epithelialization.
Anti-Inflammatory Effects
TB-500 has been shown to downregulate pro-inflammatory cytokines in preclinical models. Studies suggest it may modulate NF-kB signalling, reducing the production of TNF-alpha and interleukin-6.
Cardiac Repair
Notable research from the University of Texas Southwestern Medical Center has demonstrated TB4's ability to promote coronary vessel development and cardiac repair in animal models of myocardial infarction.
Research Applications
- Wound healing: Investigating dermal and corneal wound repair
- Cardiology: Studying cardiac tissue regeneration post-infarction
- Neurology: Exploring neuroprotective effects in brain injury models
- Sports medicine: Examining tendon, ligament, and muscle repair
- Ophthalmology: Researching corneal wound healing
TB-500 in Combination
TB-500 is frequently studied alongside other research peptides:
- BPC-157 + TB-500 (Wolverine): Investigated for synergistic tissue repair effects
- BPC-157 + TB-500 + GHK-Cu (GLOW): Comprehensive regenerative research stack
Safety and Handling
All products are sold for research purposes only. Not for human consumption. Proper laboratory protocols should be followed when handling research peptides.
Disclaimer: This article is for informational and educational purposes only. All products are sold for research purposes only.